Help needed with cost estimating a full rehab

[Rachan M.]

I'm looking to make an offer on a house in DC - 3 BRs and 1 bath, all on the main floor. It has a basement that got flooded a few years ago, water wasn't properly cleaned up and the house has since had mold, including on the main floor. The ceilings have major cracks, there are rodents. This will be a full rehab, as far as I can tell.

On the upside, there is potential to add a second level to the house, which will obviously increase the ARV by a lot.

A couple of questions:

- what is the ballpark cost of a full rehab like this?

- what would it be if a second level were added?

- how long do permits typically take in DC, and how to best manage holding costs?